This paper describes the microbial production of polyhydroxyalkanoates (PHAs) from food industry wastes by a mixed culture of activated sludge microorganisms. The physical and chemical properties of the bioplastics produced by the microorganisms from malt and soy wastes were different. The melting points of the products were compared, and the co-polymer composition of the products was investigated by gas chromatography and nuclear magnetic resonance spectroscopy. In using activated sludge to convert the carbon source into PHAs, not only are environment-friendly bioplastics produced, but also the problem of disposing of municipal activated sludge is partly solved. The selection of food industry waste as the carbon source can also reduce the cost of producing PHAs.This paper describes the microbial production of polyhydroxyalkanoates (PHAs) from food industry wastes by a mixed culture of activated sludge microorganisms. The physical and chemical properties of the bioplastics produced by the microorganisms from malt and soy wastes were different. The melting points of the products were compared, and the co-polymer composition of the products was investigated by gas chromatography and nuclear magnetic resonance spectroscopy. In using activated sludge to convert the carbon source into PHAs, not only are environment-friendly bioplastics produced, but also the problem of disposing of municipal activated sludge is partly solved. The selection of food industry waste as the carbon source can also reduce the cost of producing PHAs.The microbial production of polyhydroxyalkanoates (PHAs), or biodegradable plastics, using activated sludge and two types of food-industry wastes was studied. A sequencing batch reactor was used, which was fed with activated sludge used to treat household wastewater and with one of two food wastes, soy waste or milled malt waste. Results showed that the yield of PHAs produced using soy waste was 0.172 g/l activated-sludge biomass. More than 90% of the polymer produced using brewery malt waste was poly-β-hydroxybutyrate. The thermal stability of poly-β-hydroxybutyrate produced using malt waste was better than that of poly(3-hydroxybutyrate-co-hydroxyvalerate) produced using soy waste. (from Netherlands Biotechnol Soc/et al 4th Int Symp on Environ Biotechnology, Noordwijkerhout (Apr 10-12, 00)).

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